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Tom Hill (3rd L), CEO of cement maker Summit Materials Inc., claps before the company's IPO on the floor of the New York Stock Exchange March 12, 2015. Shares of cement maker Summit Materials Inc, controlled by Blackstone Group LP, rose as much as 12.5 percent in their trading debut on Thursday, valuing the company at $1.87 billion. REUTERS/Lucas Jackson (UNITED STATES - Tags: BUSINESS)